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FKM

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FKM ELASTOMERS

FKM SEAL MATERIAL

FKM (fluoroelastomer, also known as Viton®) is a premium elastomer based on fluorine-containing polymers, widely used in high-performance sealing solutions. This material offers outstanding resistance to high temperatures, ozone, weathering, and a broad range of chemicals, making it an ideal choice for manufacturing FKM seals, bushings, and semi-finished products.

FKM exhibits excellent chemical resistance, particularly against mineral oils, lubricants containing sulfur, HFD fluids, crude oil, and sour gas. Thanks to these properties, FKM seals ensure long-term and reliable operation in highly aggressive environments.

However, the material has limitations: it shows lower resistance to anhydrous ammonia, amines, ketones, esters, hot water, and low-molecular-weight organic acids.

With its high wear resistance, dimensional stability, and compliance with international standards, FKM is a versatile sealing solution. Certain special FKM grades are FDA-approved, making them suitable for food and pharmaceutical industry applications.

KEY ADVANTAGES OF FKM

High temperature resistance

operating range from –20 °C to +200 °C (short-term up to +250 °C)

Chemical resistance

excellent compatibility with mineral oils, fuels, acids, and aggressive process fluids.

Ozone and weather resistance

stable against ozone, UV, and environmental factors.

Mechanical strength

high abrasion resistance and durability under dynamic loads.

Food-grade compliance (special grades)

elected FKM compounds comply with FDA CFR 177.2600 for food contact applications.

Applications

FKM seals and bushings are widely used in:
  • Oil & gas industry (oilfield seals, sour gas applications, H₂S resistance)
  • Chemical and energy industry (pumps, valves, compressors)
  • Automotive industry (fuel injection systems, engines, turbochargers)
  • Aerospace applications (high-temperature sealing systems)
  • Marine and offshore equipment
  • Food and pharmaceutical industry (special FDA-approved FKM grades)
Good resistance
Mineral oils
Sulfur-containing lubricants
HFD fluids
Crude oil
Sour gases (H₂S)
Ozone, UV, weathering
Average resistance
Hot water
Steam (up to +150 °C)
Ketones (limited)
Low-molecular-weight organic acids
Certain organic acids
–
Low resistance
Anhydrous ammonia
Amines
Esters
Strong alkalis
Methanol, alcohols
–
Properties
Value
Unit
Standard
Hardness at 20°:
85 +/-2
Shore A
DIN 53505
Density:
2,51
g/cm³
DIN ISO 1183-1
100% Modulus:
>6,5
N/mm²
DIN 53504
300% Modulus:
/
N/mm²
DIN 53504
Tensile strength:
>9,2
N/mm²
DIN 53504
Elongation at break:
>180
%
DIN 53504
Rebound resilience:
>6
%
DIN 53512
Tear strength:
>5
N/mm²
DIN ISO 34-1
Abrasion:
<230
mm³
DIN 53516
Compression set:*
/
%
DIN ISO 815-1
Compression set:**
/
%
DIN ISO 815-1
Compression set:***
/
%
DIN ISO 815-1
Compression set:****
<8
%
–
Min. service temperature:
-20
°C
–
Max. service temperature (short term):
+200 (+230)
°C
–
*Compression set @ 23°C, 72 hours, 10% deflexion
**Compression set @ 70°C, 24 hours, 20% deflexion
***Compression set @ 100°C, 24 hours, 20% deflexion
****Compression set @ 225°C, 22 hours, 10% deflexion
All above established data results from random tests which were taken from the functioning production. All data was stated based on standard test-products in accordance with ISO, DIN and ASTM standards and can substantially not be extended to the completed seal. Our practical technical recommendation, either oral, written or through tests is given in conformity with our best knowledge. However, this data is to be regarded as non-obligatory advice, also taking into consideration any protective rights of a third party, and does not acquit you from making tests with our product in relation to its adaptability for the assigned process and intendment. Utilization, application and processing of the products befall completely outside of our control and are therefore solely your liability. As regards the responsibility, it will be limited to all damages in the value of the product which we delivered and you applied. Certainly, we do assure the immaculate quality of our products in concordance with our general sales and delivery conditions.

TEST ALPANA QUALITY

We take pride in our seal-making raw materials and are ready to offer samples of our semi-finished products. For testing, we provide our most popular materials, including the Max series of polyurethanes: H-Pur, SH-Pur, XSH-Pur, XH-Pur—as well as rubber bushings: NBR, FKM, H-NBR, EPDM, and MVQ!
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